来自时间依赖密度函数扰动理论和非实证的哈伯德函数的马格农
Luca Binci1,2, Nicola Marzari1,3, Iurii Timrov3
1Theory and Simulation of Materials (THEOS), and National Centre for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
概括
我们开发了一种新的第一原理方法,准确地模拟磁性材料中的自旋激发. 这种方法使用非实证的哈伯德函数和时间依赖的密度函数扰动理论来对复杂系统进行可靠的预测.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
背景情况:
- 旋转激发对于磁性和磁性设备的磁性属性至关重要.
- 在过渡金属和稀土化合物中精确建模旋转激发具有挑战性.
- 现有的方法通常依赖于经验参数或简化模型.
研究的目的:
- 为计算自旋波光谱提供一个完全基于第一原则的方法.
- 为了能够准确地建模在对线和非对线磁系统中的磁子.
- 为了克服实证哈巴德U参数和海森伯格哈密尔顿的局限性.
主要方法:
- 使用时间依赖密度函数扰动理论 (TDDFPT) 与非实证的哈伯德函数.
- 实施一个通用的非对应式配方,使其具有广泛的适用性.
- 使用Liouville-Lanczos方法有效评估动态旋转易感性.
主要成果:
- 这种新方法精确计算了自旋波光谱.
- 证明与NiO和MnO的实验数据有显著的一致性.
- 在没有经验性调整或总和规则执行的情况下满足戈德斯通条件.
结论:
- 开发的计算方案为研究旋转激发提供了一个强大的工具.
- 强调非实证的哈巴德校正对于准确的预测的重要性.
- 在描述具有局部电子状态的复杂材料中的集体自旋激发方面显示出很大的希望.
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